Volume-metering pump device

Abstract

The volume-metering pump device comprises a pump member associated with a manifold member comprising a body containing a manifold chamber having ports providing connections with the pump member, with an admission duct connected to a feed vessel, and with a discharge duct, and in which a manifold control element is mounted to move along a longitudinal axis of the manifold chamber, the ports providing connections with the admission duct and with the discharge duct being disposed facing each other and being coaxial about the longitudinal axis of the manifold chamber on either side of the port providing a connection with the pump member, and being adjacent to seats facing towards the inside of the manifold chamber with which valve-member forming portions made at the ends of the manifold control element co-operate to enable one or the other of the ports to be closed.

Description

[0001] The present invention relates to a volume-metering pump device. BACKGROUND OF THE INVENTION [0002] Volume-metering pump devices are known that comprise a pump member associated with a manifold member comprising a body containing a manifold chamber having ports providing connections with the pump member, with an admission duct connected to a feed vessel, and with a discharge duct, and in which a manifold control element is mounted to move along a longitudinal direction of the manifold chamber and is actuated by a control member so as to put the pump member into communication in alternation with the admission duct or with the discharge duct. [0003] In existing-devices, and in particular the device described in British patent document GB-A-968 452, the manifold control element is mounted to slide with reciprocating motion in the manifold chamber and has toroidal rubber valve members mounted on the manifold member outside the manifold chamber. When the pump device is in operation...

AI Technical Summary

Benefits of technology

[0006] Thus, even though it ensures that one or other of the ports is closed in leaktight manner during operation of the pump device, the manifold control element can easily be cleaned by moving the valve member away from its seat and causing the cleaning fluid to flow around the valve member.

Problems solved by technology

This fluid is difficult to extract during washing so that in practice it is not possible to perform pumping under sterile conditions when using existing devices.

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